Cindy's Freezer Fudge

4 Cups Sugar
1 Can evaporated milk
2 12 oz packages milk chocolate chips
2 cubes butter
1 tsp. vanilla

Bring milk & sugar to a boil (in large pan)
Boil 11 minutes stir constantly.  Put chocolate
chips and butter in a bowl.  Pour boiling mix over and stir until well blended.  Add vanilla and pour into a
9 x 13 pan and freeze.